include/linux/suspend.h

   1 #ifndef _LINUX_SUSPEND_H
   2 #define _LINUX_SUSPEND_H
   3
   4 #if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64)
   5 #include <asm/suspend.h>
   6 #endif
   7 #include <linux/swap.h>
   8 #include <linux/notifier.h>
   9 #include <linux/init.h>
  10 #include <linux/pm.h>
  11 #include <linux/mm.h>
  12 #include <asm/errno.h>
  13
  14 #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
  15 extern void pm_set_vt_switch(int);
  16 extern int pm_prepare_console(void);
  17 extern void pm_restore_console(void);
  18 #else
  19 static inline void pm_set_vt_switch(int do_switch)
  20 {
  21 }
  22
  23 static inline int pm_prepare_console(void)
  24 {
  25         return 0;
  26 }
  27
  28 static inline void pm_restore_console(void)
  29 {
  30 }
  31 #endif
  32
  33 typedef int __bitwise suspend_state_t;
  34
  35 #define PM_SUSPEND_ON           ((__force suspend_state_t) 0)
  36 #define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 1)
  37 #define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)
  38 #define PM_SUSPEND_MAX          ((__force suspend_state_t) 4)
  39
  40 /**
  41  * struct platform_suspend_ops - Callbacks for managing platform dependent
  42  *      system sleep states.
  43  *
  44  * @valid: Callback to determine if given system sleep state is supported by
  45  *      the platform.
  46  *      Valid (ie. supported) states are advertised in /sys/power/state.  Note
  47  *      that it still may be impossible to enter given system sleep state if the
  48  *      conditions aren't right.
  49  *      There is the %suspend_valid_only_mem function available that can be
  50  *      assigned to this if the platform only supports mem sleep.
  51  *
  52  * @begin: Initialise a transition to given system sleep state.
  53  *      @begin() is executed right prior to suspending devices.  The information
  54  *      conveyed to the platform code by @begin() should be disregarded by it as
  55  *      soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
  56  *      @prepare(), @enter() and @finish() will not be called by the PM core.
  57  *      This callback is optional.  However, if it is implemented, the argument
  58  *      passed to @enter() is redundant and should be ignored.
  59  *
  60  * @prepare: Prepare the platform for entering the system sleep state indicated
  61  *      by @begin().
  62  *      @prepare() is called right after devices have been suspended (ie. the
  63  *      appropriate .suspend() method has been executed for each device) and
  64  *      before the nonboot CPUs are disabled (it is executed with IRQs enabled).
  65  *      This callback is optional.  It returns 0 on success or a negative
  66  *      error code otherwise, in which case the system cannot enter the desired
  67  *      sleep state (@enter() and @finish() will not be called in that case).
  68  *
  69  * @enter: Enter the system sleep state indicated by @begin() or represented by
  70  *      the argument if @begin() is not implemented.
  71  *      This callback is mandatory.  It returns 0 on success or a negative
  72  *      error code otherwise, in which case the system cannot enter the desired
  73  *      sleep state.
  74  *
  75  * @finish: Called when the system has just left a sleep state, right after
  76  *      the nonboot CPUs have been enabled and before devices are resumed (it is
  77  *      executed with IRQs enabled).
  78  *      This callback is optional, but should be implemented by the platforms
  79  *      that implement @prepare().  If implemented, it is always called after
  80  *      @enter() (even if @enter() fails).
  81  *
  82  * @end: Called by the PM core right after resuming devices, to indicate to
  83  *      the platform that the system has returned to the working state or
  84  *      the transition to the sleep state has been aborted.
  85  *      This callback is optional, but should be implemented by the platforms
  86  *      that implement @begin(), but platforms implementing @begin() should
  87  *      also provide a @end() which cleans up transitions aborted before
  88  *      @enter().
  89  *
  90  * @recover: Recover the platform from a suspend failure.
  91  *      Called by the PM core if the suspending of devices fails.
  92  *      This callback is optional and should only be implemented by platforms
  93  *      which require special recovery actions in that situation.
  94  */
  95 struct platform_suspend_ops {
  96         int (*valid)(suspend_state_t state);
  97         int (*begin)(suspend_state_t state);
  98         int (*prepare)(void);
  99         int (*enter)(suspend_state_t state);
 100         void (*finish)(void);
 101         void (*end)(void);
 102         void (*recover)(void);
 103 };
 104
 105 #ifdef CONFIG_SUSPEND
 106 /**
 107  * suspend_set_ops - set platform dependent suspend operations
 108  * @ops: The new suspend operations to set.
 109  */
 110 extern void suspend_set_ops(struct platform_suspend_ops *ops);
 111 extern int suspend_valid_only_mem(suspend_state_t state);
 112
 113 /**
 114  * arch_suspend_disable_irqs - disable IRQs for suspend
 115  *
 116  * Disables IRQs (in the default case). This is a weak symbol in the common
 117  * code and thus allows architectures to override it if more needs to be
 118  * done. Not called for suspend to disk.
 119  */
 120 extern void arch_suspend_disable_irqs(void);
 121
 122 /**
 123  * arch_suspend_enable_irqs - enable IRQs after suspend
 124  *
 125  * Enables IRQs (in the default case). This is a weak symbol in the common
 126  * code and thus allows architectures to override it if more needs to be
 127  * done. Not called for suspend to disk.
 128  */
 129 extern void arch_suspend_enable_irqs(void);
 130
 131 extern int pm_suspend(suspend_state_t state);
 132 #else /* !CONFIG_SUSPEND */
 133 #define suspend_valid_only_mem  NULL
 134
 135 static inline void suspend_set_ops(struct platform_suspend_ops *ops) {}
 136 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
 137 #endif /* !CONFIG_SUSPEND */
 138
 139 /* struct pbe is used for creating lists of pages that should be restored
 140  * atomically during the resume from disk, because the page frames they have
 141  * occupied before the suspend are in use.
 142  */
 143 struct pbe {
 144         void *address;          /* address of the copy */
 145         void *orig_address;     /* original address of a page */
 146         struct pbe *next;
 147 };
 148
 149 /* mm/page_alloc.c */
 150 extern void mark_free_pages(struct zone *zone);
 151
 152 /**
 153  * struct platform_hibernation_ops - hibernation platform support
 154  *
 155  * The methods in this structure allow a platform to carry out special
 156  * operations required by it during a hibernation transition.
 157  *
 158  * All the methods below, except for @recover(), must be implemented.
 159  *
 160  * @begin: Tell the platform driver that we're starting hibernation.
 161  *      Called right after shrinking memory and before freezing devices.
 162  *
 163  * @end: Called by the PM core right after resuming devices, to indicate to
 164  *      the platform that the system has returned to the working state.
 165  *
 166  * @pre_snapshot: Prepare the platform for creating the hibernation image.
 167  *      Called right after devices have been frozen and before the nonboot
 168  *      CPUs are disabled (runs with IRQs on).
 169  *
 170  * @finish: Restore the previous state of the platform after the hibernation
 171  *      image has been created *or* put the platform into the normal operation
 172  *      mode after the hibernation (the same method is executed in both cases).
 173  *      Called right after the nonboot CPUs have been enabled and before
 174  *      thawing devices (runs with IRQs on).
 175  *
 176  * @prepare: Prepare the platform for entering the low power state.
 177  *      Called right after the hibernation image has been saved and before
 178  *      devices are prepared for entering the low power state.
 179  *
 180  * @enter: Put the system into the low power state after the hibernation image
 181  *      has been saved to disk.
 182  *      Called after the nonboot CPUs have been disabled and all of the low
 183  *      level devices have been shut down (runs with IRQs off).
 184  *
 185  * @leave: Perform the first stage of the cleanup after the system sleep state
 186  *      indicated by @set_target() has been left.
 187  *      Called right after the control has been passed from the boot kernel to
 188  *      the image kernel, before the nonboot CPUs are enabled and before devices
 189  *      are resumed.  Executed with interrupts disabled.
 190  *
 191  * @pre_restore: Prepare system for the restoration from a hibernation image.
 192  *      Called right after devices have been frozen and before the nonboot
 193  *      CPUs are disabled (runs with IRQs on).
 194  *
 195  * @restore_cleanup: Clean up after a failing image restoration.
 196  *      Called right after the nonboot CPUs have been enabled and before
 197  *      thawing devices (runs with IRQs on).
 198  *
 199  * @recover: Recover the platform from a failure to suspend devices.
 200  *      Called by the PM core if the suspending of devices during hibernation
 201  *      fails.  This callback is optional and should only be implemented by
 202  *      platforms which require special recovery actions in that situation.
 203  */
 204 struct platform_hibernation_ops {
 205         int (*begin)(void);
 206         void (*end)(void);
 207         int (*pre_snapshot)(void);
 208         void (*finish)(void);
 209         int (*prepare)(void);
 210         int (*enter)(void);
 211         void (*leave)(void);
 212         int (*pre_restore)(void);
 213         void (*restore_cleanup)(void);
 214         void (*recover)(void);
 215 };
 216
 217 #ifdef CONFIG_HIBERNATION
 218 /* kernel/power/snapshot.c */
 219 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
 220 static inline void register_nosave_region(unsigned long b, unsigned long e)
 221 {
 222         __register_nosave_region(b, e, 0);
 223 }
 224 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
 225 {
 226         __register_nosave_region(b, e, 1);
 227 }
 228 extern int swsusp_page_is_forbidden(struct page *);
 229 extern void swsusp_set_page_free(struct page *);
 230 extern void swsusp_unset_page_free(struct page *);
 231 extern unsigned long get_safe_page(gfp_t gfp_mask);
 232
 233 extern void hibernation_set_ops(struct platform_hibernation_ops *ops);
 234 extern int hibernate(void);
 235 #else /* CONFIG_HIBERNATION */
 236 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 237 static inline void swsusp_set_page_free(struct page *p) {}
 238 static inline void swsusp_unset_page_free(struct page *p) {}
 239
 240 static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}
 241 static inline int hibernate(void) { return -ENOSYS; }
 242 #endif /* CONFIG_HIBERNATION */
 243
 244 #ifdef CONFIG_PM_SLEEP
 245 void save_processor_state(void);
 246 void restore_processor_state(void);
 247
 248 /* kernel/power/main.c */
 249 extern int register_pm_notifier(struct notifier_block *nb);
 250 extern int unregister_pm_notifier(struct notifier_block *nb);
 251
 252 #define pm_notifier(fn, pri) {                          \
 253         static struct notifier_block fn##_nb =                  \
 254                 { .notifier_call = fn, .priority = pri };       \
 255         register_pm_notifier(&fn##_nb);                 \
 256 }
 257 #else /* !CONFIG_PM_SLEEP */
 258
 259 static inline int register_pm_notifier(struct notifier_block *nb)
 260 {
 261         return 0;
 262 }
 263
 264 static inline int unregister_pm_notifier(struct notifier_block *nb)
 265 {
 266         return 0;
 267 }
 268
 269 #define pm_notifier(fn, pri)    do { (void)(fn); } while (0)
 270 #endif /* !CONFIG_PM_SLEEP */
 271
 272 #ifndef CONFIG_HIBERNATION
 273 static inline void register_nosave_region(unsigned long b, unsigned long e)
 274 {
 275 }
 276 static inline void register_nosave_region_late(unsigned long b, unsigned long e)
 277 {
 278 }
 279 #endif
 280
 281 #endif /* _LINUX_SUSPEND_H */